Propelling mechanism for boats.



Patented Aug. 28, I900.

0. H. BLOMSTRUM PROPELLING MECHANISM'FOR BOATS.

(Application filed Jan. 27, 1900.)

(No Model.)

lasJl WASHINGYON u o Unrrnn STATES PATENT OFFICE.

CARL H. BLOMSTROM, OF MARQUETTE, MICHIGAN, ASSIGNOR TO THE LAKE SHOREENGINE WORKS, OF SAME PLACE.

PROPELLING MECHANISM FOR BOATS.

SPECIFICATION forming part of Letters Patent No. 657,054, dated August28, 1900. Application filed January 27, 1900- Serial No. 2,933. (Nomodel.)

To all whom it may concern:

Be it known that I, CARL H. BLOMSTROM, a resident of the city and countyof Marquette, State of Michigan, have invented certain new and usefulImprovements in Propeller Mechanism for Boats, of which the following isa full, clear, and exact description.

v This invention relates more particularly to that class of mechanismfor propelling boats in which the propeller wheel or screw is providedwith blades that may be shifted with respect to the body or hub of thewheel so that by varying the angle of the blades the boat can be causedto move either in a forward or backward direction or can be held againstmovement in either direction.

The object of the invention is to improve the construction of thepropeller-wheel and the means whereby the blades are shifted; and thisobject is accomplished by the novel features of construction hereinafterdescribed, illustrated in the accompanying drawings, and particularlypointed out in the claims at the end of this specification.

Figure 1 is a view, partly in longitudinal section and partly in sideelevation, of the propelling mechanism embodying the invention. Fig. 2is a view in horizontal section through the hub of the wheel and theretaining-sleeve, the outer end of the shaft and the cranks of one ofthe blades being shown in side elevation. Fig. 3 is an end View with thecap of the wheel-hub removed, the blades being partially broken away.Fig. 4 is a view in central cross-section through the inner ends of thepropeller-blades, parts being shown in elevation. Fig. 5 is a view invertical crosssection on line 5 5 of Fig. 1. Fig. 6 is a detailperspective view of one of the propellerblades.

The shaft A, whereby the propeller-wheel will be driven, is suitablysustained in an outboard-bearing B, the body I) of which Will be of ashape to conform to the hull of the boat to which it will be attached.The outer cylindrical sleeve of the bearing B is shown asscrew-threaded, as at Z), and with this screwthreaded sleeve engages acorrespondinglythreaded sleeve or gland O, the purpose of which is toretain against longitudinal movement the hub of the propeller-wheel, aswill presently more fully appear. gland O is preferably formed with aconcave recess at its end to receive suitable packing, and a similarrecess is also preferably formed at the outer end of the sleeve of thebearing B. The sleeve 0 has formed in piece therewith or suitablyconnected thereto one of the sections 0 of a bearing that receives therevoluble hub D of the propeller-wheel, the other section 0 of thisbearing being bolted, as at 0 to the section 0. (See Fig. 5.) Thesections 0 c of the bearing are recessed, as at 0 to receive an annularflange d at the inner end of the hub D, this flange serving to hold thehub againstlongitudinal movement. The outer end of the hub D is formedwith bearings to receive the stems or journals e of the propeller-bladesE, and these journals are held in place by a cap D, that is bolted, asat d, to the hub D. The chambered outer portion of the hub D serves toreceive the cranks e, that are fixed to the stems e of thepropeller-blades E, and each of the cranks e is provided with awrist-pin e extending inwardly, as clearly shown in Figs. 1, 4t, and 6of the drawings. WVith the wrist-pins (2 engages a plate or extension F,projecting from the outer end of the shaft A, and preferably set withina recess of the shaft and secured thereto, as at f. The plate orextension F is formed with slots f, that receive the wristpins 6 andpreferably also the plate F is formed with a longitudinal slot f toreceive a pin g, that extends between the stems c of thepropeller-blades, the ends of this pin setting within holes or seats 6in the stems. (See Fig. 4.) Upon the interior of the hub D are formedgrooves d, that receive the edges of the plate F, thereby causing thehub D of the propeller-wheel to revolve in unison with the shaft A,while permitting the shaft to move longitudinally with respect to thehub.

From the foregoing description it will be seen that when the shaft A isshifted longitudinally a corresponding movement will be imparted throughthe wrist-pins c to the cranks e of the propeller-blades E, and by thismeans the angles of the blades can be varied in order to cause theblades to effect either the forward or backward movement of the boat, orif the blades be turned so that The sleeve or they extend in the planeof revolution of the wheel then the boat will be held against movementin forward or backward direction.

In order to enable the propeller-shaftA to be moved longitudinally inorder to effect the desired shift of the propellerblades, I prefer toprovide this shaft with a collar a, having an annular groove therein toreceive a ring a, this ring being furnished with laterally-projectingpins (6 with 'which will engage the yoke-shaped endof the shifter bar orlever A. The inner end of the propellershaft is shown as provided with agear-wheel A by which revolution will be imparted to the shaft, althoughit will be understood that the shaft may be revolved by any convenientmeans. I

It is manifest that the precise detailsof construction above set out maybe varied by the skilled mechanic without departing from the spirit ofthe invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. Propeller mechanism for boats comprising a revoluble hub and abearing for h'olding it against longitudinal movement, propeller-bladesjournaled in said hub and provided at their inner ends with cranks, apropeller-shaft provided at its outer end with a plate or extensionkeyed to said hub but 1011- git udin-ally movable with respect thereto,said extension being also connected to the cranks of thepropeller-blades whereby said blades may be shifted.

2. Propeller mechanism forboats comprising propeller-blades provided attheir inner ends with stems or journals and with cranks, a revoluble hubwherein said blades are journaled,said hub havinga removable cap forholding said journals in place, a longitudinally-movable shaft connectedto the cranks of said blades and keyed to said hub butlongitudinallymovable with respect thereto, and a bearing wherein said hub isrevolubly mounted and whereby it is held against longitudinal movement.

' 3. Propeller mechanism for boats comprising'propell'er-blades providedat their inner ends with stems or journals and with cranks, a pinextending into and between the stems of the propel1er-blades,alongitudinally-movable shaft provided at its outer end with an extensionhaving a slot through which said pin passes, said extension beingconnected with the cranks of the propeller-blades and a hub wherein saidpropeller-blades are journaled and a suitable bearing for said hub.

I CARL H. BLOMSTROM. Witnesses:

FRED H. BEGOLE, J. FRED KERN.

